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首页> 外文期刊>ICES Journal of Marine Science >Balanced harvesting is the bioeconomic equilibrium of a size-structured Beverton-Holt model
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Balanced harvesting is the bioeconomic equilibrium of a size-structured Beverton-Holt model

机译：平衡收获是尺寸结构的Beverton-Holt模型的生物经济平衡

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摘要

Balanced harvesting (BH) was introduced as an alternative strategy to size-at-entry fishing with the aim of maintaining ecosystem structure and functioning. BH has been criticized on a number of grounds, including that it would require an infeasible level of micromanagement and enforcement. Recent results from a size-spectrum model show that the distribution of fishing mortality across body sizes that emerges from the behaviour of a large number of fishing agents corresponds to BH in a single species. Size-spectrum models differ from classical size-structured models used in fisheries as they are based on a bookkeeping of biomass transfer from prey to predator rather than a von Bertalanffy growth model. Here we investigate a classical Beverton-Holt model coupled with the Gordon-Schaefer harvesting model extended to allow for differential fishing pressure at different body sizes. This models an open-access fishery in which individual fishing agents act to maximize their own economic return. We show that the equilibrium of the harvesting model produces an aggregate fishing mortality that is closely matched to the production at different body sizes, in other words BH of a single species. These results have significant implications because they show that the robustness of BH does not depend on arguments about the relative production levels of small versus large fish.
机译：为了保持生态系统的结构和功能，引入了平衡捕捞（BH）作为规模捕捞的替代策略。 BH已被批评为多种原因，其中包括微观管理和执行水平不可行。大小-光谱模型的最新结果表明，从大量捕捞剂的行为中得出的捕捞死亡率在人体大小上的分布对应于单个物种中的BH。尺寸谱模型不同于渔业中使用的经典尺寸结构模型，因为它们基于簿记从猎物到捕食者的生物量转移，而不是基于冯·贝塔兰菲的生长模型。在这里，我们研究了经典的Beverton-Holt模型以及Gordon-Schaefer收获模型，该模型扩展了允许在不同体形下的不同钓鱼压力。这是一种开放式渔业的模型，在这种渔业中，个体捕捞代理采取行动以最大限度地提高自己的经济回报。我们表明，收割模型的平衡产生的捕捞总死亡率与不同体型（即单个物种的BH）的产量紧密匹配。这些结果具有重要意义，因为它们表明BH的稳健性不取决于有关小鱼与大鱼相对产量的争论。

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